ICD-10 Code H80.12 – Otosclerosis involving oval window, obliterative, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.12 – Otosclerosis involving oval window, obliterative, left ear
What it is
H80.12 identifies obliterative otosclerosis affecting the oval window in the left ear. This condition causes abnormal bone remodeling around the stapes footplate, which can reduce sound transmission.
Clinical signs
Typical findings include progressive conductive hearing loss and a normal-looking tympanic membrane. Tinnitus may occur, and audiology may show a conductive pattern; clinical features vary, so refer to documentation.
When to use this code
Use H80.12 when the provider documents obliterative otosclerosis with oval window involvement limited to the left ear. It is appropriate for confirmed diagnosis in the chart, including otologic evaluation or surgical assessment. If laterality or obliterative type is not specified, check documentation.
Do not use for
Do not use this code for otosclerosis in the right ear, bilateral disease, or non-obliterative otosclerosis. Also avoid it when the record only says hearing loss without a documented otosclerosis diagnosis.
Coding tip
Match laterality and obliterative status exactly to the provider’s wording before assigning H80.12.